netdev - Re: [patch iproute2 v6 0/3] tc: Add -bs option to batch mode

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Date:   Mon, 8 Jan 2018 07:40:14 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Chris Mi <chrism@...lanox.com>
Cc:     David Ahern <dsahern@...il.com>, Phil Sutter <phil@....cc>,
        "marcelo.leitner@...il.com" <marcelo.leitner@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "gerlitz.or@...il.com" <gerlitz.or@...il.com>
Subject: Re: [patch iproute2 v6 0/3] tc: Add -bs option to batch mode

On Mon, 8 Jan 2018 08:00:00 +0000
Chris Mi <chrism@...lanox.com> wrote:

> > >> I wonder whether specifying the batch size is necessary at all.
> > >> Couldn't batch mode just collect messages until either EOF or an
> > >> incompatible command is encountered which then triggers a commit to
> > >> kernel? This might simplify code quite a bit.  
> > > That's a good suggestion.  
> > 
> > Thanks for your time on this, Chris.  
> After testing, I find that the message passed to kernel should not be too big.
> If it is bigger than about 64K, sendmsg returns -1, errno is 90 (EMSGSIZE).
> That is about 400 commands.  So how about set batch size to 128 which is big enough?


Use sendmmsg?